Hmmm... Well, now I am well and truly puzzled. I made these statements on the basis of what I did in my Mini (Mk 1 install) and what I have been doing in the last week on my Mk 2 install in the Laguna. I may well be totally wrong (it sounds like I have it the wrong way round) and to be honest, I have noticed a number of times that I seem to be the opposite way round to what other people are saying in various threads.

I've just been to look at the wiring loom I'm building in the shed. The high current power feed from the ISO power connector on the Laguna is a fused line, switched by the ignitiion. I can track this through the car's circuit diagram. This is connecting to the orange, ignition sense wire on the sled.

The puny, weedy, 0.5mm(s), unfused permanent 12V feed from the ISO is connecting with the fused, filtered yellow memory wire on the sled.

This does imply you are right, and I am totally wrong, much to my great consternation. Thanks for pointing this out - now how the heck am I going to sort out a decent permanent 12V feed without bodging the harness around, dammit!

Sigh. Back to the drawing board.

As for the advice - what I meant was, choose the unswitched feed from the wire leading to the ignition switch upstream of the switch itself: this is the brown feed wire. Mini ignition switches around that period were not really that hot. They did have the benefit of having an (unfused) auxiliary feed line on the switch that may or may not have been brought out from the switch itself. If it was brought out into the loom, then the wire colour would be PINK with no tracer colour. This is "ON" in all positions of the switch except the OFF position, and also at the AUX position which allows you to remove the key from the switch with power still on. This was specifically to allow for radio usage. It's on many Austins, Rovers and Triumphs of the period. The Innocenti may not have the same switch type, so you would need to check.